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A Study on Phase Transformation Exhibited in Ti49±xNi49∓xFe2 (x = 0 to 1) Shape Memory Alloys

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Abstract

The phase transformations and damping capacities in as solution-treated and 450 °C aged Ti49±xNi49∓xFe2 (x = 0 to 1) SMAs were investigated. In Ti48Ni50Fe2, Ti48.5Ni49.5Fe2 and Ti49Ni49Fe2 SMAs, no transformation occurred in the as solution-treated state, and B2 ↔ R1 transformation induced by Ti3Ni4 precipitates appeared when the SMAs were aged at 450 °C. DMA measurement showed that these as solution-treated SMAs exhibited strain glass behavior. The Ti49.5Ni48.5Fe2 specimen exhibited a two-stage B2 ↔ R2 ↔ B19′ transformation in the as solution-treated state, but after aging at 450 °C, the R2 ↔ B19′ was suppressed and B2 ↔ R1 appeared with B2 ↔ R2 remaining. The B2 ↔ R2 transformation is related to Fe, which causes point defects in the matrix. The Ti50Ni48Fe2 SMA showed a two-stage B2 ↔ R2 ↔ B19′ transformation in both solution-treated and 450 °C aged specimens. Microstructural observations showed Ti3Ni4 precipitates in Ti48Ni50Fe2, Ti48.5Ni49.5Fe2, Ti49Ni49Fe2 and Ti49.5Ni48.5Fe2 SMAs aged at 450 °C. The morphology and distribution of Ti3Ni4 precipitates are likely related to the amount of B2 ↔ R1 transformation.

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Author Contributions

Conceptualization, Y-CL and S-KW; methodology, Y-CL; investigation, Y-CL; writing—original draft preparation, Y-CL; writing—review and editing, Y-CL and S-KW; supervision, S-KW; data curation, Y-CL; project administration, S-KW. funding acquisition, S-KW. All authors have read and agreed to the published version of the manuscript.

Funding

This research was funded by the Ministry of Science and Technology (MOST), Taiwan, Grant Number MOST 109-2221-E-002-120-MY2.

Conflict of interest

The authors declare no conflict of interest.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, National Taiwan University, Taipei, 106, Taiwan

    Yi-Cheng Lai & Shyi-Kaan Wu

  2. Department of Mechanical Engineering, National Taiwan University, Taipei, 106, Taiwan

    Shyi-Kaan Wu

Authors
  1. Yi-Cheng Lai
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  2. Shyi-Kaan Wu
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Correspondence to Shyi-Kaan Wu.

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Manuscript submitted May 17, 2021; accepted July 26, 2021.

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Lai, YC., Wu, SK. A Study on Phase Transformation Exhibited in Ti49±xNi49∓xFe2 (x = 0 to 1) Shape Memory Alloys. Metall Mater Trans A 52, 4636–4648 (2021). https://doi.org/10.1007/s11661-021-06416-0

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  • DOI: https://doi.org/10.1007/s11661-021-06416-0

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